
import numpy as np

a = np.arange(15).reshape(3,5)

print(a)



b="-2.0"
#print(int(b))

c="-3"
print(float(c))

class  student:
    a=1

    def __init__(self,name="hujun",score=80,b=3):
        self.name=name
        self.score= score
        self.a = b



li = student()
print(li.name,li.score,li.a)

jun= student("yajun",90,5)
print(jun.name,jun.score,jun.a)
